Qt：获取QTableView中的数据，进行搜索

1.创建QTableView内容

QStandardItemModel *model = new  QStandardItemModel(ui->tableView);
// 四列
model->setHorizontalHeaderItem(0, new QStandardItem("1"));
model->setHorizontalHeaderItem(1, new QStandardItem("Name"));
model->setHorizontalHeaderItem(2, new QStandardItem("3"));
model->setHorizontalHeaderItem(3, new QStandardItem("4"));
// 三行
    model->setItem(0, 0, new QStandardItem("001"));
    model->setItem(0, 1, new QStandardItem("One"));
    model->setItem(0, 2, new QStandardItem("011"));
    model->setItem(0, 3, new QStandardItem("111"));

    model->setItem(1, 0, new QStandardItem("002"));
    model->setItem(1, 1, new QStandardItem("Two"));
    model->setItem(1, 2, new QStandardItem("122"));
    model->setItem(1, 3, new QStandardItem("222"));

    model->setItem(2, 0, new QStandardItem("003"));
    model->setItem(2, 1, new QStandardItem("Three"));
    model->setItem(2, 2, new QStandardItem("133"));
    model->setItem(2, 3, new QStandardItem("333"));

2.获取根据第几列查询，并补全列表

    QSortFilterProxyModel *proxyModel = new QSortFilterProxyModel();
    proxyModel->setSourceModel(model);
    proxyModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
    proxyModel->setFilterKeyColumn(1);  // 第二列，根据名字查找
    ui->tableView->setModel(proxyModel);

3.搜索框填写背景内容

    ui->lineEditSearch->setPlaceholderText("Search here...");

4.连接信号和槽

    QObject::connect(ui->lineEditSearch, &QLineEdit::textChanged, [=](const QString &text) {
        proxyModel->setFilterRegExp(QString(".*%1.*").arg(text));
    });